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Monday 22 January 2018 at 12:25
Looking really nice. Do you mean the solder holes where the battery holder solders into? If so, another light sand (sometimes takrs a rougher sand paper) and then desolder from the back side of the board. Once you neutralize the area, then you can refill them from the topside of the board. Someti...
Source: http://pinside.com/pinball/forum/topic/help-troubleshooting-sound-on-sys11-mpu#post-4188960